PreprintCC BY 4.0arXiv
A first look at strange-quark polarization in top-quark decays with CMS Open Data
Abstract
We present a first realization of strange-quark polarimetry in top-quark decays. The longitudinal polarization of Λ baryons is measured in the strange jets of hadronic W→ cs̅ decays in semileptonic top-quark pair events, using 16.39 fb−1 of the public CMS data of pp collisions at √s=13 TeV. The W decay produces the strange quark fully polarized, so that the Λ polarization measures the transfer of the quark polarization in fragmentation. With the limited statistics available, our result is consistent both with zero and with the transfer inferred from the flavor-averaged LEP measurements. The statistical reach with the full Run-2, Run-3 and HL-LHC datasets is projected.
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BibTeX
@misc{kats2026first,
title = {{A first look at strange-quark polarization in top-quark decays with CMS Open Data}},
author = {Yevgeny Kats},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.42143},
eprint = {2610.42143},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.42143},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - A first look at strange-quark polarization in top-quark decays with CMS Open Data
AU - Yevgeny Kats
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.42143
UR - https://arxiv.org/abs/2610.42143
AB - We present a first realization of strange-quark polarimetry in top-quark decays. The longitudinal polarization of Λ baryons is measured in the strange jets of hadronic W→ cs̅ decays in semileptonic top-quark pair events, using 16.39 fb^−1 of the public CMS data of pp collisions at √s=13 TeV. The W decay produces the strange quark fully polarized, so that the Λ polarization measures the transfer of the quark polarization in fragmentation. With the limited statistics available, our result is consistent both with zero and with the transfer inferred from the flavor-averaged LEP measurements. The statistical reach with the full Run-2, Run-3 and HL-LHC datasets is projected.
ER -